一個由加利福尼亞大學(xué)圣地亞哥醫(yī)學(xué)院研究人員領(lǐng)導(dǎo)的國際科學(xué)家團(tuán)隊,, 報道了DNA異常序列,在雙相性精神障礙(躁狂抑郁癥)早發(fā)風(fēng)險中起重要作用,,所謂的DNA異常序列也就是已知的罕見拷貝數(shù)變異(CNVs),。
這項發(fā)現(xiàn)將發(fā)表在12月22期《神經(jīng)元》(Neuron)上。
CNVs是基因組改變,,此改變是指太少或太多的DNA片段拷貝,。研究人員已經(jīng)知道自發(fā)出現(xiàn)的CNVs(新生)--不是遺傳自親代的遺傳突變--顯著地增加一些神經(jīng)精神狀態(tài)的風(fēng)險性,象精神分裂癥或自閉癥譜系障礙,。但是還不清楚他們在雙相性精神障礙中的作用,,雙相性精神障礙也就是先前的躁狂抑郁癥。
Jonathan Sebat博士,,為加利福尼亞大學(xué)圣地亞哥基因組醫(yī)學(xué)研究所的精神病學(xué)與細(xì)胞分子醫(yī)學(xué)副教授,,是主要的研究者,與同事們發(fā)現(xiàn)新生CNVs對約5%早發(fā)性雙相性精神障礙有顯著的遺傳風(fēng)險,,這出現(xiàn)在童年或成年早期,。
換句話說,有新生突變會增加出現(xiàn)疾病早發(fā)的機(jī)會,,研究的第一作者Dheeraj Malhotra這樣說,,他是Sebat實(shí)驗(yàn)室的助理項目科學(xué)家。
躁狂抑郁癥的病因或原因還不清楚,。一個清楚的遺傳因素--疾病在家族中傳播--但是先前的研究在鑒定關(guān)鍵易感基因方面已取得有限的成功,,盡管它主要集中在常見的遺傳變異。
Malhotra說,,雖然新發(fā)現(xiàn)沒有確定地指出特異的基因或基因組區(qū)域,,但它顯示了令人信服的依據(jù),即罕見的拷貝數(shù)突變強(qiáng)烈地促成早發(fā)性雙相性精神障礙的發(fā)展,。他補(bǔ)充到,,大量雙相性精神障礙家族的全基因組或外顯子組測序是確定對雙相性精神障礙風(fēng)險性影響的所有新生突變形式的總基因組所必需的。(生物谷bioon.com)
doi:10.1016/j.neuron.2011.11.007
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High Frequencies of De Novo CNVs in Bipolar Disorder and Schizophrenia
Dheeraj Malhotra,Shane McCarthy,Jacob J. Michaelson,Vladimir Vacic,Katherine E. Burdick,Seungtai Yoon,Sven Cichon,Aiden Corvin,Sydney Gary,Elliot S. Gershon,Michael Gill,Maria Karayiorgou,John R. Kelsoe,Olga Krastoshevsky,Verena Krause,Ellen Leibenluft,Deborah L. Levy,Vladimir Makarov,Abhishek Bhandari,Anil K. Malhotra,Francis J. McMahon,Markus M. N?then,James B. Potash,Marcella Rietschel,Thomas G. Schulze,Jonathan Sebat
Summary While it is known that rare copy-number variants (CNVs) contribute to risk for some neuropsychiatric disorders, the role of CNVs in bipolar disorder is unclear. Here, we reasoned that a contribution of CNVs to mood disorders might be most evident for de novo mutations. We performed a genome-wide analysis of de novo CNVs in a cohort of 788 trios. Diagnoses of offspring included bipolar disorder (n = 185), schizophrenia (n = 177), and healthy controls (n = 426). Frequencies of de novo CNVs were significantly higher in bipolar disorder as compared with controls (OR = 4.8 [1.4,16.0], p = 0.009). De novo CNVs were particularly enriched among cases with an age at onset younger than 18 (OR = 6.3 [1.7,22.6], p = 0.006). We also confirmed a significant enrichment of de novo CNVs in schizophrenia (OR = 5.0 [1.5,16.8], p = 0.007). Our results suggest that rare spontaneous mutations are an important contributor to risk for bipolar disorder and other major neuropsychiatric diseases.